Leighton Meester and Adam Brody Welcome a Baby Girl! Find Out Her Unique Name

It's the baby we've all been waiting for! Teen-dream duo Leighton Meester and Adam Brody welcomed a baby girl last month, and have kept the details under wraps — until now!

The former Gossip Girl star gave birth to their little one on August 4, Us Weekly reports, and managed to keep it a total secret for more than a month. And while, like everything else in their relationship, details were kept on the down low, TMZ obtained their daughter's birth certificate. As in, we now know Blair Waldorf and Seth Cohen's, er, Meester and Brody's daughter's name: Arlo Day!

The two struck up a relationship while working together on their 2011 film Oranges. Since then, every detail of their private life has remained, well, extremely private. Their engagement was a total shock, and their wedding was even more under wraps. The couple never confirmed Meester's pregnancy, although she was seen around Los Angeles cradling a baby bump.

Only in a Reddit AMA last August did Brody give a glimpse inside their home life. "I do some stuff but she definitely does the heavy lifting [figuratively]. Literally, I do the heavy lifting," he told fans. When asked how many kids he'd like with Meester, he replied: "I say twelve," he joked, " and I decide!"